Web looping mechanism foe feinting peesses



in) Model.) 2 Sheets-Sheet 1 J. L. 00X. WEB LOOPING. MEGHANI-SM'FQR PRINTING PRESSES.

2 Sheets-Sheet 2,

(No model.

. ,1. L. 00X. WEB LOOPING MECHANISM FOR PRINTING PRESSES.

. .1 W w m 8 b a 11 S 1 x TW A .w u r J." Y. J d n e t. n e t a UNrrE TATES JOSEPH L. COX, OF BATTLE CREEK,- MICHIGAN, ASSIGNOR TO THE DUPLEX PRINTING PRESS COMPANY, OF SAME PLACE.

WEB-LOOPING MECHANISM FOR PRINTING-PRESSESI SPECIFICATION forming part of Letters Patent No. 501,456, dated July 11, 1893.

Application filed August 27, 1892- Serial No. 444,318. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH L. COX, of Battle Creek, in the county of Calhoun and State of Michigan, have invented certain new and useful Improvements in Web-Looping Mechanism for Printing-Presses; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters and figures of .reference marked thereon, which form part of this specification.

This invention is an improvement in paperweb looping meohanismfor perfecting printing presses, and is especially designed as an improvement upon the mechanism for operating the web looping frame shown in Letters Patent No. 478,503, granted to me July 5, 1892.

The invention consists in the novel construction of the operating cams, and combinations of parts hereinafter clearly described and claimed.

In the drawings Figure l is a detail partial side elevation of a printing press such as is shown in my aforesaid patent with my improved looping mechanism attached thereto. Fig. 2 is a view of the looping mechanism detached. Fig. 3 is a detail cross sectional view. Fig. 4: is an enlarged face View of one of the cams.

In the press indicated in the drawings the web of paper to, is led from the rollW between calendar feed rolls W then over a looping roller Z, down under a guide roller M, then beover a guide roller m, down under a second looping roller Z and thence to the delivery rolls, not shown. The cylinders are j ournaled in, and reciprocated over the beds by carriage Z, crank wheels Z and pitmen Z and the looping rollers Z, Z are both journaled in reciprocating bars L, all constructed and adapted to operate substantially as in my aforesaid patent, and my present invention principally consists in improved means for reciprocating rollers Z, Z whereby I am enabled to attain a much greater speed, and hence print hundreds more papers in a given time than can be done by the mechanism shown in my patent. Heretofore the bars L were vertically reciprooated by regular double, or heart-shaped, cams on the ends of the transverse shaft J on which the lower ends of said bars rested. Idispense with cams on shaft J for this purpose and connect the lower ends of barsL by short links B to the forward ends of horizontal vibrating levers A, said links being pivotally connected to the bars and levers. The rear ends of said levers are pivoted on a transverse shaft or studs a, attached to the frame below the main shaft thereof. I preferably employ a lever A and its connections at each side of the mill. Being duplicates in arrangement and operation, only one has been shown in drawings, as but one would be visible when the machine is shown in side elevation. Lever A has a wrist pin 0 attached to it, near its center and projecting from its side, said pin being pref erably provided with a friction roller 0, engaging in the camway or groove d, of a cam wheel D, which is journaled on a shaft E intermediate the main shaft and shaft J, shaft E being driven bya gearewhich meshes with a gear on the main shaft, and with the gear wheel J on shaft J. By this gearing, motion is transmitted from the main shaft to the feeding and inking mechanisms. The gears should be of such relative size that shaft E will revolve once for each impression produced, and leversAwill be vibrated once, and rollers Z, Z raised and lowered once during each revolution of shaft E.

In the operation of this press, the paper is fed in continuously, but during the taking of an impression that portion of the web being imprinted must be stopped; this is done by means of the web-looping rollers which rise during the taking of an impression,and roller Z forms a loop in the web which takes up all the paper paid in, while roller Z gives off a loop of paper-to the delivery which it formed in its descent after the previous impression. As soonas the impression is complete the rollers Z, Z descend, and the loop formed byZ together with what is paid in by the feed during the descent of the rollers is drawn rapidly through the press by means of the delivery and roller Z which makes a loop in the web equal to the loop previously formed by roller Z, while the delivery draws out as much web as is paid in by the feed rollsduring the descent of the looping rollers. The cam wheels D are set on shaft E so that thelevers A will be actuated at the proper times to raise and lower the rollers Z, Z.

In reference to Fig. 4: it will be seen that the portion of the cam groove between the points marked 2-34c, is regular in formation, and during the time roller 0 is traveling through this portion of the cam groove (from 2 to 4) the web of paperin the press is tripped between the traveling impression cylinders and the type forms on the stationary beds, requiring a regular uniform movement of the loops in unison with the supply of paper fed in by the calendars or feed rolls and demanded by the delivery rolls so as to preserve the tension of the web through the press and prevent breaking of the paper. During the rest of the revolution of the cam the paper is nowherein contact with the type, or confined by impingement between any object from feed rolls to delivery rolls, thus permitting the transfer or looping of the web forward to be done by an irregular portion of the cam, between points 4,1, 2, thereof. The irregularity of the portion 4,1-, 2, of the cam is necessitated by the doing away of the apex of the regular heart cam employed in my former patent at one point (say 2) and byrounding out the recess at the opposite point (say at). By this construction of cam, the rollers are reversed in their motion (raised and lowered) without jerk and eased up before reversal.

What I mean by regular is that such portion of the cam is made very accurate as for a regular-heart-cam movement;and what I mean by irregular is that such portion of the cam groove is deflected to the extent necessary to dispense with abrupt points or recesses in the cams or grooves, thereby avoiding any sudden or abrupt shocks from the quick reversals of the parts reciprocated by said cams.

In my patent aforesaid No. 478,503, dated July 5, 1892, and in my Patent No. 459,813, dated September 22, 1891, the heart-shaped cams employed to reciprocate bars L have a recess at one end of their longest diameter, and an acute angle or abrupt point at the other end, both of which produce an instantaneous reversalof the movement of the looping rollers, and a shock at the moment of reversal, which I have found by experience limits the speed of the press; whereas the improved cam, and cam movement, herein shown and described have been found to work more satisfactorily, allowing greater speed and decreasing noise and wear.

F designates a rod playing in suitable guides attached to the main frame above lever A, the lower end of the rod bearing on said lever. G is a helical spring on said rod and f, f, nuts on the rod by which the tension of the spring is regulated. The spring acts to force the rod, and consequently lever A, down. They are employed principally to keep the wristpin roller against the inner wall of the camgroove, the outer wall of the groove servlng principally to provent undue vibration of the lever A by momentum, and to guide the Wristpin around the shorter curves of the cam groove. This spring-controlled rod F is not entirely indispensible.

By employing the vibrating levers A, the cams D are only required to have about half the travel or throw of the regular heart cam used in said patents, for the end of levers A to which bars L are connected travel through a much greater are than the portion to which the wrist-pin is connected; and the reduction in throw of cam renders it easier to operate, and lessens the wear and jar incidental to running the machine.

Having described my invention, what I claim as new, and desire to secure by Letters Patent thereon, is

1. In a machine for printing on a web of paper, the combination with mechanism for continuously feeding the Web into the press, and a movable looping frame and roller for taking up the infed web between the feed and printing mechanisms, While the impression is being taken; of a vibrating leverconnected to the roller supports at one end and pivoted at its other end, and having wrist pin intermediate its ends, and a rotating cam engaging said wrist pin and causing said lever to vibrate, and mechanism for rotating said cam, once for each impression made upon the paper, substantially as described.

2. In a machine for printing on a web of paper, the combination with mechanism for feeding the web continuously into the press, and a movable looping roller for taking up the infed web betweenthe feed and printing mechanisms while the impressing is being taken; of bars supporting said looping roller, levers connected to said bars and to ELflXGCl point on the frame, rotating cams engaging said levers for oscillating the same, and mechanism for rotating said cam so as to raise and lower the looping roller once for each impression made in the press, substantially as and for the purpose described.

3. In a web printing press the combination of paper feeding mechanism, and web guide rollers and a web looping roller and its supports, a vibrating lever connected to the roller supports at one end and pivoted at the other end, and having a wrist pin intermediate its ends; with a rotating cam engaging said pin and adapted to vibrate the lever, said cam having neither abrupt angles nor dopressions, and mechanism for rotating said cam whereby said looping roller is caused to rise during the taking of an impression and to descend during the interval between impressions, substantially as described.

4-. In a printing press the combination of the web feeding devices and means for taking an impression on the web, of a reciprocating web looping roller, the supports for said roller, vibrating levers each pivoted at one end, and connected by a pivoted link to one of the roller supports at the other end, a wrist pin on each lever, rotating cams engaging said wrist pins for vibrating said levers and springs for depressing-said levers, and means substantially as described whereby said cams are rotated once for each impression produced, thereby vibrating the levers,

and. reciprocating the looping roller, once for-1o each impression substantially as specified.

In testimony that I claim the foregoing as my own I affix my signature in presence of two Witnesses.

. JOSEPH L. COX.-

\Vitnesses:

W. S. LEONARD, F. W. DUNNING. 

